When I look through the defenders tier list of GP, I dont really feel satisfied at all, because imo they factor CP way too much there. I wonder, what would this list look like, if you put CP aside?
Usually I sit in 10-12 gyms anyway with enough high CP/high quality defenders, so when I conquer new gyms I would like to place the best defenders there are in it without caring too much about CP.
So there are basically some questions, when it comes to rating a defenders strength for me:
1. How good (hard hitting and annoying) are the moves?
2. Potential time in the combat / durability / bulk (-> more total damage)
3. Deterring effect. (e.g. Omastar is annoying af if you dont have a good plant attacker and it has Ancient power, but most people dont even feel threatened by it because they simply dont even know about the potential)
4. How many counters exist, how useful are the counters in general (if there is only one D-nite in the gym and the rest is Gyarados/Snorlax/Vaporeon, I dont take a Lapras with me, because it isnt worth it to waste a spot for a mon, that only has use for one defender, whereas I would always take a Jolteon with me, because it can handle both Gyarados and Vape, even SW-Dnites.)
5. How well does the defender perform vs counters?
I didnt do any deeper research yet to do my own tier list, BUT what I can definitely say:
Everything with Confusion should be just below Blissey and Snorlax, as it hits so fricking hard and absolutely deters people from attacking your gym.
Same goes for IS-Lapras.
Also I feel like Poliwrath is still quite strong with Ice Punch and Bubble.
And so on...
Anyway: I will now give an initial list idea and would love to hear your thoughts and potential improvements on this.
Tier 1:
Blissey (any set)
Snorlax (Zen-Body only) (Zen-HB/HS, L-BS as B-sets)
Tier 2:
Exeggutor (C-SeB or SoB)
Slowbro (C-IB)
Lapras (IS-anything)
Tier 3:
Vaporeon (AT or HP)
Dragonite (DT-O/H or SW/DC)
Espeon (C-PB)
Slowking (C-B or P)
Poliwrath (B-IP)
Tier 4:
Cloyster (IS-HP)
Rhydon (MS-SE)
Donphan (C-PR)
Omastar (RT-AP with W-AP as B set)
Wiggly (P-PR)
Venusaur (RL-SBomb)
I'm quite sure, I was missing out on a few high quality defenders, but sure as hell I would not include any Gyarados or Tyranitar, because they have horrible 2-level disadvantages vs super common and useful Eevolutions and Stab-lacking suboptimal movesets.